Debt - Additional Information (Details) shares in Millions, $ in Millions, € in Billions, £ in Billions	1 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($)	Nov. 30, 2025 USD ($) shares	Nov. 30, 2024 USD ($)	Nov. 30, 2023 USD ($)	Nov. 30, 2025 EUR (€)	Nov. 30, 2025 GBP (£)
Schedule Of Debt Outstanding [Line Items]
Debt extinguishment costs		$ 272.0	$ 41.0	$ 79.0
Debt extinguishment and modification costs		(409.0)	$ (79.0)	$ (111.0)
Debt extinguishment cost, premium paid		271.0
Ships and ship improvements		40,600.0
Vessels and material intellectual property		22,400.0
Vessels and related assets		20,800.0
Debt instrument, convertible, liquidity component minimum threshold		$ 1,500.0
Debt Instrument, Debt Covenant, Period Five
Schedule Of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required debt to capital covenant (percent)		65.00%
Eurodollar
Schedule Of Debt Outstanding [Line Items]
Debt instrument, convertible, equity component minimum threshold		$ 5,000.0
Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt extinguishment costs		11,600.0
New Revolving Facility
Schedule Of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000.0
New Revolving Facility | Debt Instrument, Debt Covenant, Period One
Schedule Of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required interest coverage covenant, ratio		2.5
New Revolving Facility | Debt Instrument, Debt Covenant, Period Two
Schedule Of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required interest coverage covenant, ratio		3.0
Revolving Facility
Schedule Of Debt Outstanding [Line Items]
Line of credit facility available amount		$ 4,500.0
Carnival Holdings (Bermuda) II Limited | New Revolving Facility
Schedule Of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity		4,500.0
Carnival Holdings (Bermuda) II Limited | Multi-Currency Revolving Facility
Schedule Of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity		1,900.0			€ 0.9	£ 0.1
Convertible
Schedule Of Debt Outstanding [Line Items]
If-converted value above par value		1,000.0
Convertible notes		84.5
Export Credit Facility | Export Credit Facility | Sun Princess II Limited
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		1,800.0
Export Credit Facility | Export Credit Facility | Sun Princess Limited
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		1,800.0
5.13% Notes Payable Due May 2029 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 1,300.0
5.13% Notes Payable Due May 2029 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		5.13%			5.13%	5.13%
Notes Payable Due March 2030 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 1,000.0
Notes Payable Due March 2030 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		5.75%			5.75%	5.75%
Notes Payable Due June 2031 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 1,000.0
Notes Payable Due June 2031 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		5.88%			5.88%	5.88%
Euro-denominated Notes Payable Due July 2031 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 1,200.0
Euro-denominated Notes Payable Due July 2031 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		4.13%			4.13%	4.13%
Notes Payable Due August 2032 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 3,000.0
Notes Payable Due August 2032 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		5.75%			5.75%	5.75%
Notes Payable Due February 2033 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 2,000.0
Notes Payable Due February 2033 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		6.13%			6.13%	6.13%
Notes Payable Due August 2027 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 400.0
Line of Credit, Floating Rate Due August 2027 | Unsecured Debt | Guarantor Subsidiaries | Secured Overnight Financing Rate (SOFR)
Schedule Of Debt Outstanding [Line Items]
Debt instrument, variable rate (percent)		1.13%
Notes Payable Due October 2027 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 300.0
Line of Credit, Floating Rate Due October 2027 | Unsecured Debt | Guarantor Subsidiaries | Secured Overnight Financing Rate (SOFR)
Schedule Of Debt Outstanding [Line Items]
Debt instrument, variable rate (percent)		1.25%
Notes Payable Due November 2027 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 300.0
Line of Credit, Floating Rate Due November 2027 | Unsecured Debt | Guarantor Subsidiaries | Secured Overnight Financing Rate (SOFR)
Schedule Of Debt Outstanding [Line Items]
Debt instrument, variable rate (percent)		1.38%
Notes Payable Due March 2026 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		7.63%			7.63%	7.63%
Notes Payable Due March 2027 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		5.75%			5.75%	5.75%
Notes Payable Due May 2028 | Secured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		10.38%			10.38%	10.38%
Notes Payable Due May 2029 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		6.00%			6.00%	6.00%
Notes Payable Due June 2030 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		10.50%			10.50%	10.50%
Export Credit Facility Due 2037 | Export Credit Facility
Schedule Of Debt Outstanding [Line Items]
Debt instrument, face amount	$ 800.0
Export Credit Facility Due 2033 | Export Credit Facility
Schedule Of Debt Outstanding [Line Items]
Undrawn export credit facilities		$ 7,800.0
Export Credit Facility Due 2035 | Export Credit Facility
Schedule Of Debt Outstanding [Line Items]
Value of vessels subject to negative pledges		19,300.0
Convertible Notes Payable Due December 2027 | Unsecured Debt
Schedule Of Debt Outstanding [Line Items]
Debt instrument, redemption price, percentage	100.00%
Debt conversion, converted instrument, amount		$ 1,100.0
Converted instrument, shares issued (in shares) | shares		69.1
Convertible Notes Payable Due December 2027 | Unsecured Debt | Guarantor Subsidiaries
Schedule Of Debt Outstanding [Line Items]
Debt instrument, interest rate (percent)		5.75%			5.75%	5.75%
Cash payment		$ 500.0